Cleaning chair covers

[ineedsomepeaceandquiet]

I need some advice on how to clean my cream dining chair covers which aren't removable and looking very grey. Any suggestions would be super

Have you tried upholstry cleaner? Its the right product for the job so should be successful. The directions will be on the bottle.
I like to use real cotton towelling for this kind of thing as its really absorbant and lifts the dirt out well.