Can anyone suggest the best way to clean tile above the water line? My tile seems to have the grout "leaking" out a bit, and in the past I've used a hydrochloric acid/water solution. I'm just wondering if there is a better product. The acid does the job, but I'm concerned it may damage the grout.

Also, if anyone can give some insight into why my tile grout does this, I'd appreciate it as well! Thanks.