Hi,
I use this on my Series and 110;
Shell Ensis PW 265
Wax film solvent deposit
Shell Ensis PW 265 is a solvent deposited, water displacing, wax film corrosion
preventive.
Designed by Shell for North Sea oil rigs, used by both the UK/US military. Excellent stuff, actually forces water/moisture out of the metal, and seeps through welds/joints etc.
Costs £90 for 20L drum (minimum buy), will do loads of chassis and anything else tht's metal. Let me know if you want more info, not sure of the rules about posting phone numbers and product details.
Cheers