I have a quarry tile floor that i am stem cleaning with bleach to clean the grout and this is working well but I am not getting the old sealer off, which was barely any seal at all, so I need to know what to use to strip this off. Then I am looking for the Produt used on the old brick floors I've seen in convention centers which is very strong with a beautiful laqure like finish.Please help me I have a real mess right now!