Can I do heavier housecleaning such as washing a fridge?
Also can I organize closets and do other long term housework?
I can’t say that it is forbidden to do, however there is a custom not to do heavy housecleaning during the nine days, rather only light housekeeping.
Kovetz M’bais Halevi 13 pg. 25, Kol Hamisablim Oleha 9 ftnt, 67-72.