How do you clean Michael Kors sneakers?

I have a pair of gray MK sneakers that need to be cleaned. I haven't worn them in a long time (due to the fact that they are dirty) and I would like to clean them without ruining them. (The last time I tried to clean sneakers, I ruined them).
Also, anyone has any hacks to getting off scruff marks off white converse shoes?
How do you clean Michael Kors sneakers?
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