Gas Stove :  Regular cleaning of your gas cook stove will keep it looking as good as the day you bought it, but you need to take care with the cleaning products you use on your gas stove or oven. Many commercial cleansers and abrasives will cause discoloration and can scratch gas stove and oven surfaces.
Before cleaning any gas stove, be sure the unit is off and completely cooled. Steam burns can occur from wiping a hot surface with a wet cloth or sponge. Regular cleaning of spills will lessen your cleaning work load. Wipe your stovetop after each use when it has cooled. Clean burners with dish soap and a plastic scouring pad.
Stubborn cooked-on spills can be cleaned with a mild abrasive cleanser and a cloth, or make a paste from baking soda and water for a mild homemade alternative. Wash removable burner grates in a sink full of warm, soapy dishwater with a plastic scouring pad. Rinse all parts with warm clear water and dry. 
Be careful to avoid the gas ports on your burners. If they should become plugged with debris, poke the ports clean with a toothpick or straight pin, or brush gently with a soft-bristled brush. For auto ignition, check the port and area below the igniter wire and clear it as well. Debris left under the igniter can keep the gas burner from lighting. Spills and drips from fat, grease, and acidic foods like tomatoes should be wiped up immediately using a paper towel to keep finishing from discoloring.

Pressure Cooker :

Do’s:-   Always ensure sufficient quantity of water. Since pressure-cooking is cooking with steam, there must always be sufficient water in the cooker to produce steam.
Always ensure that the vent tube is completely free of any blockage by looking through the vent tube and ensuring that light is visible. Keep the vent tube clean and fixed tight.
The weight must be placed on the cooker only when the steam starts coming out steadily. Ensure that the safety valve is securely fixed in its place on the lid. Ensure that the rubber gasket is properly placed on its place in the lid.

     Avoid damage to the sealing rim of the lid and keep the handles fully tightened when in use. If there is any problem, don’t try to meddle. You should immediately approach the Apex service center.

Don’ts:- Never ever place a dry/empty cooker on a heat source. There is a fair chance of the gasket getting burnt or the pressure cooker getting damaged. Overloading should not be done. Overloading reduces performance and efficiency.

     Never go beyond the prescribed instructions and invent your own techniques of cooking. This might prove harmful. Do not attempt to force open the lid of the cover if there is pressure inside. Always remove the weight valve first and then the lid. Never tap the rim of the cooker body with serving spoons, forks etc as these may nick its sealing surface and allow steam to escape.
     Do not use soda or hard abrasives to wash your cooker. You should not leave the cooker standing in water as the shine will dull. Finally, the pressure cooker body should not be used for Deep Frying.
Some more tips: The body and lid of your cooker is better off with warm soapy water.   So while washing, better take care if it has to retain its shine.

Discolorations:- Certain properties of water and certain materials of food may cause darkening of the inside of the cooker. This is actually quite harmless. This discoloration does not affect aluminium or the food cooked in it, in anyway. When this discoloration occurs, it can be removed with an aluminium cleaner such as steelwool, tartaric acid or any cleaning agent. Otherwise, put a small ball of tamarind or a slice of fresh lime in the water used in cooking. This will avoid darkening

     Clean the weight valve with soap water and clear out all traces of soap before drying. Gasket should always be cleaned in cold water and that’ll extend its life. Never store your cooker in a sealed or closed condition. Circulation of air is very necessary.

Maintaining anything is a must for better performance. Pressure cookers are no different.

Mixer Grinder :  First read all the manufacturer’s instructions and see what they recommend. Clean the mixer with warm soapy water before using. You know you have to get all of that transport stuff off, the little white and brown flakes caused from paper and fibers. Clean the beaters with warm soapy water too! Also take a damp cloth and run it over the cord.

After each use wipe the mixer with a warm dishcloth. It is generally found that if you clean it as it goes, life runs smoother in the kitchen. Then you will not be angry with yourself when you go to use your mixer the next time.

Be sure to put the bowl in warm water after emptying the contents into baking materials. Makes for easier cleaning later. take the dishcloth and run it over the cord after each use. Clean the beaters really well. This is very important so that with the next use you don’t have yucky stuff all dried up and ready to fall into the new batter.

Now one of the most important things is to store the mixer where it will have no harm come to it or to the children.

When using the mixer be sure to keep the plug out of the way. Also do not allow the mixer to sit too close to the edge. This could cause for a fall and then a new mixer.

Don’t use your mixer near the sink where running water can damage the mixer and yourself.

After you have mixed the batter the desired time, be sure and turn it off, and be very sure you unplug the mixer before giving those beaters to the little one who is ever so patiently waiting for them.

Non Stick : Apex Non Sticks comes with a care and maintenance guide. You should read this immediately before beginning to use your new cookware.

Perhaps the single most important thing to remember when using non-stick cookware is to always be careful of what you put in it. Only use utensils that are approved for non-stick cookware, such as plastic, or wooden utensils.

Never use a wire whisk, beaters, or metal utensils. Never cut foods in the pan. It only takes a second to take the food out of the pan to cut it, and will add years to the life of your pan.

When you first begin using your new pans, it is also a good idea to condition them. This is done by coating the interior surface of the pan with shortening or oil before the first use. This only needs to be done the first time you use your pan, but will greatly increase the effectiveness of the non-stick surface.

It is also a good idea to use lower temperatures whenever possible. Of course you will set your burner on high to bring water to a boil, but it is suggestion by some non-stick cookware manufacturers that you use a lower setting for most of your cooking.

Always wash your pans thoroughly before the first use, and after each use. Never use any type of abrasive when cleaning your pans. You can generally clean your cookware in hot soapy water without a lot of effort.

If something should happen to get stuck onto your pan, soaking it for a short time will usually remedy the situation. If you need to scrub the surface, make sure that the material you are scrubbing with is approved for non-stick surfaces. Steel Wool is definitely not a good idea and will drastically shorten the life of your non-stick cookware.

Additionally, although some non-stick cookware is advertised as dishwasher safe, I do not recommend doing this. The harsh abrasives in some dishwasher detergents can damage the non-stick finish of your cookware. Washing them in the dishwasher once or twice will probably not noticeably ruin your cookware, but repeatedly washing them in the dishwasher can shorten the life of the non-stick surface rather quickly.