SEND THEM TO ME!! I am hard up and nothig better to do than wash cloths by hand in Lux flakes! I have some lens chamois cloths that I was using in the 90s with my D4s ! They still wipe a lens clean and dry when it gets rained on, spray thrown over it or a dog shakes and chucks muck and water all over the front.
Actual mud (rally car, motocross types, are bound to come up against this scenario), saltwater riskers (boats, angling, breaking waves over rocks - those huge waves that crash over the lighthouse etc - the air is full of salt spray, you are even breathing it in, but you may not realise it! Distilled water in a plastic bottle, one of those with a pull out drinking spout. Squirt gently, I said GENTLY, as in almost dribble some water on, to wash the wet mud or salt spray off, salt is infinitely worse than clean water. Irrigating it with clean water will dilute the salt and shift the mud off. Then you can wipe clean afterwards. THAT is so much easier with a UV filter than it is with a bare lens. (HINT).