Had the same experience as you when i used the HCL89 from http://hcl89.byethost10.com as well. I was looking for something to clean the tiles on my kitchen, and i used it, it removed all the grime and dirt with relative ease
Had same mould problem same as TS, so decided to purchase the HCL89 thing from http://hcl89.byethost10.com as recomended I used it about a month back and so far the mould seems to be gone Looks like it worked out well for me, thanks
Tried the HCL thing from http://hcl89.byethost10.com on my timber floor just before chinese new year and it works fantastically, my timber flooring looks flawless now, recommended to use
Its mould cause by excessive moisture You can use something called HCL89. Its strong enough to clean the mould as well as kill it I usually get it from http://hcl89.byethost10.com or http://hcl89.atwebpages.com One thing i like about it is that is creates a protection like on my wall so that it prevents future mould or etc Hope this helps you out