@kndred
You can't. Room history is not controlled by IMVU.
Room history is collected by third parties running their own software, which scans all rooms on IMVU. Room occupants within rooms is public data via IMVU's API.
SOME of those third parties do accept bribes to block your name from being searched on their software, but not all of them.
If you bribe a third party to block your name on their software, the person stocking you only has to move on to the next third party tool to still get the same data.
Right now, I know of at least 4 third party tools that collect room history. Only 2 out of those 4 accept bribes, last I checked ... and the bribes only lasted a month / had to be repaid monthly.