RiverRDR2 Menu _BEST_
However, there will be situations where neither baths or rivers will be nearby. Fortunately, there is a method to clean your clothes on the go, without getting wet at all. First off, hop onto your horse. Then, press and hold L1 and go into your Horse Inventory menu. Go to the bottom of the wheel, aka the section where you change your outfit. Change your outfit into whatever you want. Your previous outfit will come out pristine. Just, in case you have a custom outfit, remember to save it in your wardrobe and have it on your horse, so as not to lose it.