http://en.wikipedia.org/wiki/Hydrochloric_acid
When you say 10:1 dilution ration it really is not descriptive if you do not know the original strength of the HCl. Industrial HCl would rot your sinus and lungs just by pouring from the bottle. This stuff is really bad for you and the environment.
Take the advice of others here, use vinegar and lots of elbow grease.