You can clean it with a paper towel I don't recommend a rag they can create more stains. or you can use a stain remover and mix it with vinegar or white vinegar, lemon juice, or you can use lukewarm water.
or another way is
you can use delicate detergent which is actually gentle detergent but its just marked delicate. handwash only in cold water not warm nor hot. then you use vinegar water to rinse.
