I use Murphy Oil soap and Dicor, twice a year. These products have served me well since 1999. I use the soap and a soft brush on a dry sunny day. The following day I do any cracks in the dicor. Keeping the roof clean also seems to help reduce black streaks on the sides of the coach.
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Lt Keefer
2018 Hurricane 29M
CHF, Saf-T-Plus, SumoSprings
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