If the aluminum doors and Windows slide badly, the average person will put lubricating oil on the track or apply a little wax to increase the lubrication of the track. However, after a period of time, the lube coated track will easily become dirty, at this time, you can take some remaining egg shells, mash it with some water, put it in a cloth bag, and use it to wipe the lube coated window track, you can keep the track clean.