Hello to All,

Problem
We have 1285 sqft of tumbled travertine stone pavers outside next to pool. W all
the hurricane rains and debris pushed into the crevices, mold has penetrated.
See pics

What I've already done
- 1/2 cup of ammonia to
1 gallon of very hot water, little dish soap. Dipped 1 ft stiff long handle
bristled brush into solution, and scrubbed three times...barely any results
-
1 cup of bleach [which I know is a no-no] into 1.5 gal of very hot water, w
comet power, some dish soap, agitated and scrubbed vigorously.
see after pic
and w close up

Solution ?
Cannot use any acids and I was
already pushing the envelop w using bleach...did it in a remote place...last few
picture is what I did this morning w both of the above processes...still
mold.

Anyone that comes us w a solution I will gladly send you a $50 gift
certificate. I have not hired anyone, but had a pro bring out his solution, he
used it and it did nothing better. Very well known in the industry.

In the last pic, is there anything effective I can use to fill these voids if I used power-washer first remove?

I
would certainly appreciate your help, thank you - tstex