Before you use a solvent make sure it isn't going to damage your gun, accessories or cause personal injury. These substances are typically flammable or easily combustible. If they are used for the wrong purpose or accidentally end up in certain components they can combust or cause an explosion. Some specific solvent uses and potential issues are described below. 

 GUN BORE CLEANER :  Standard bore cleaners are solvents used to clean steel barrels and other parts. Patches or cleaning pellets lightly dampened with cleaner should be pushed or pulled through the barrel. Dry ones should be used to remove any remaining solvent. A light coat of oil should be applied after cleaning. These cleaners are typically corrosive to brass barrels and other parts made from or plated with soft metals. Brass barrels should be cleaned with oil only. Bore cleaners are generally flammable, make sure they don't get into parts that will be exposed to high pressure other than the barrel and breech. Allow enough time for residual solvent to dry before oiling the barrel.

 PENETRATING OILS :  WD-40, Liquid Wrench and similar petroleum solvents are highly flammable. These should not be used to lubricate any part of an airgun, tank, pump or introduced into any pressurized component. If used as a cleaner or to loosen rusted parts they should be thoroughly removed after. 

ACETONE :  This is commonly used to clean metal parts for touch-ups and refinishing. Many plastic parts, paints and coatings on airguns and accessories are easily dissolved with acetone. This includes many Crosman grips, forearms and some of the adjustment marks and dots on sights. Acetone is highly flammable and the fumes are highly explosive.

 ISOPROPYL ALCOHOL :  This is commonly used to clean parts and remove oils and greases. It won't dissolve plastic parts but it is flammable and can produce explosive vapors.

 DISH SOAP :  This is an excellent parts degreaser and it's very inexpensive. It can be used undiluted or mixed with varying amounts of water to dissolve oil and grease and easily rinses clean. Steel parts should be dried thoroughly right away and oiled to prevent rust.