Here's a daft question for the panel On my S124, the engine undertray was damaged over the Christmas period and removed. It has never had a gearbox undertray in my ownership (or if so it was removed by someone and never refitted). Since then, I've sourced both undertrays and I'm having them fitted next week. Given that the exposed bits will have been covered in muck and salt, should I get the underside cleaned before I get the undertrays fitted and, if so, how? Or am I just being stupid and should just get them fitted?