We park and fly our planes in rain all the time. I donít get the aversion to using soap and water to wash that nasty cement dust off. Original Dawn dish soap is a good choice. A vacuums is never going to get the cement dust off 100% by itself.
RV-9A: #90949 Under Construction
RV-10: #40637 Completed/Sold 2016
Cozy MKIV:#656 Completed/Sold 2007
"Donor Exempt" but donated through Dec. 2023