how to clean bare aluminum engine - gray dyna motor

[04ctd]

it's a MESS.

bought a used 06, looks like he washed it by riding it in the rain.

the motor has a lot of stains on it.

i used Castrol Greased Lightning (basically a weak acid) and i think i dripped it
and made a few spots with the acid.

what to do?

[TLMitchell]

Originally Posted by 04ctd

it's a MESS.

bought a used 06, looks like he washed it by riding it in the rain.

the motor has a lot of stains on it.

i used Castrol Greased Lightning (basically a weak acid) and i think i dripped it
and made a few spots with the acid.

what to do?

Read a thread a while back somewheres about a dealer's wash guy spraying S-100 all over a hot engine on a nearly new bike with a silver/alum engine. Ended up stained and they tried everything they could think of without success. Last shot was to call the MoCo for advice and they <no kidding> recommended Scrubbing Bubbles bathroom cleaner. Stuff along with some elbowgrease supposedly returned the engine to like new.

Since then I've been using SB and a long-bristled *extremely* soft brush when both my black/chrome and silver/alum engines get grungy. Stuff works for me. Your mileage may vary...

TL

'86 FXRS
'07 Ultrabarge