It's a very practical gel for cleaning dirt, dust and small debris in the gaps of cars, household appliances or furniture. Such as air conditioner outlet where are difficult to reach by hand, and our cleaner gel do not leave any gel residues, stripes or traces, it is a very practical household cleaning kit product. This cleaning gel could be used repeatedly till the color turn to dark, then you have to replace the gel with a new one. When cleaning finished, just put the keyboard cleaning gel back in box and keep in cool place.