[Maverick]

Really dirty ----> mild soap and water and a soft nail brush.
Not to bad ----> clean with damp cloth.

Maintain ------> Choice is endless

Autoglym from motorfactors applies easier and requires less time.
The stuff they use for household sofa is good but takes longer to use and requires more effort to finnish it off.
But everyone seems to have a favorite product, think you have to try them and see which suits.