Welcome Ulf. I think a lot of people use ACF50 light lubricant anti corrosion spray on the wing seams etc , and something heavier on the underbody. I havent used it, but this seems popular https://www.lanoguard.co.uk/product...Y_UVqveCk2gb-WJMWC53-xcNP7EaAv7MEALw_wcB
or of course there's the traditional Waxoyls, also Comma do a wax-oil spray that I have used- As with everything its all easier up in the air. Alternatively, develop an oil leak at 50+kph, should cover everything banghead I know!!

"DOT" 35th Anniversary Edition Plus 8- family owned from new. Rolls Royce Pewter.
06 Saab 93