"Sanded" - I filled the gastank with about 4 cups of sand, shook it like crazy for about 10 minutes. Then I flushed it out with water and dried it with a hairdryer.
That BJ guy from handibikes told me to do it. Actually, he may not have told me how to wash it out. I read some other posts here that said you flush it out with gas, so I might have screwed up a little, but that's why I put so much oil in it.
And that's that.