I had a sticky soda spot on that model sneakers and thought I ruined them. tbh What worked was alcohol on a cotton swab dabbed lightly until the tacky feel went away & then a good brushing once dry and for muddy splashes, I let the mud dry completely then brush off and only spot treat what remains.
Rain is tough where I live too, so I do a quick routine after each wear dry them away from heat, brush, then spray with a water repellent made for that model. Not perfect. Keeps them presentable.
If you have an oily mark, tap on cornstarch and leave it overnight then brush it out the next day.
Close the valve so the center pin is up, bayonet the adapter a quarter turn with the O-ring seated, then pump high volume first and switch to high pressure until the board feels firm around 12 to 15 PSI for a 10'6 board. To disconnect with minimal loss, keep the pin up, twist off in one smooth move, cap fast, and if you hear more than a short hiss reseat the adapter and check the O-ring.
