A power washer is the best for cleaning stone, brick and patios. Check out my post:
https://karupp-did.net/power-washer/ for lots of before and after pics. Mold Stains in concrete and brick shouldn't be a problem with a power washer. Good luck!
Thanks for that
I find that the power washer spits up the dirt from between the bricks. I have used a spray containing white vinegar ,a small amount if dish soap and water. I put it in a spray bottle but I bet you could use a sprayer that you hand pump. If you don't get the results you nee, try less water and more vinegar.
Thanks I’ll try this