Heres one for you- although not strictly cleaning.
To avoid overspray when spraying lube on your chain, get a 4 pint plastic milk carton (empty) and cut a slot through it so the chain can pass through it and you spray the lube down the neck of the bottle:)
Baby wipes clean all the brake dust and chain lube off of wheels easily.
Tesco Value ones are a bit small and thin, whereas Morrisons ones are thick and much larger. Also good for cleaning your hands in the garage when you have no access to soap and water. And babies arses.
I used to use Mr SHeen to get a really good shine and a protective film over the tank and fairings - now that I’m actually getting paid i shell out for the Autoglym stuff - good EVERYWHERE (other than brakes of course) and takes oil and tar off as if it wasnt there!