[nynor]

a question for rick (and anyone else that cares to post a solution):

i bought a used expansion tank for the 951. it clearly had oil mixed with the coolant and has a bit of residue inside it. i knew this before i bought, i was sent pictures. i have put dishwasher detergent in it and rinsed it out. this helped a little. i put isopropyl alcohol in there and let it sit. this helped a little.

what can i use to get it clean? do i need to worry about it?

update: i just sprayed some brake cleaner in there, which usually strips that kind of thing right off. no such luck. the residue is loose, i can rub it off with my finger. obviously the reach of my finger is very limited. i am just going to go with and plan on a full radiator flush later this summer. it is due, anyway.