Wood question

Hey guys, so I have a lot of wood fencing behind my house that I practice on for cleaning and stuff. I use F10 to clean it, but after awhile it always seems to leave white residue behind, and I swear I think I’m washing it off good, but I guess not lol. My question is do I need to wash it off with more pressure, longer? Am I letting the f10 sit too long? I let it dwell for 20 mins or so. Thank you guys for all the info you provide

It’s really hard to tell without some really clear HD pictures to look at.

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I have never used F10 to clean a fence but if you are seeing “white residue” look at it very closely because it sounds like you have some furring going on. In other words it may be very small wood fibers but without pics it’s just a guess.