I spoke to Rob about you.
He is not cross. At the time he might have been a bit disappointed but long forgotten.
He would be happy for you to come over and clean his flat.
How about sending him a tex ? something like:
"I want to come and clean your flat this weekend.
Saturday is best for me, but Sunday is OK too.
Let me know what time is best for you.".
It is up to you. But better to be able to feel good about everything , if you see what I mean.
Then we can all be happy ag