hoarding house mate

[bobbb]

hi i wonder if i could get some advice..

i live in a shared house with 3 others. the house isnt the cleanest of houses but i do my best to keep my areas clean n tidy. ive recently realised that one of my housemates has a serious hoarding problem to the degree that he regularly sprays his room with insectacide and pestacide. im getting quite worried as i think not only is the stuff hes hoarding posing a health risk to us all but so is his use of these chemicals..

ive already helped to clear some of his stuff a few months back but fear its just been replaced with more stuff..

any advice on how can i tackle this would be greatly appreciated..

thanks.