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There are several products you can buy to soften caulk for removal. The most affordable are WD-40, alcohol, and vinegar. Industrial-grade isopropyl alcohol can be used for caulk that won’t budge, but you should hire a professional before using this solution. There are also a variety of products available at your local home improvement store that are made specifically for removing caulk.

You should not use caulk as a direct substitute for grout, but it can be used as a temporary solution or supplement for repairing minor cracks. Caulk is more flexible and does not dry as hard as grout. To perform the repair, first use a grout or rotary saw to remove the old, cracked grout. Then, apply a matching caulk into the cracks, smooth it over, and allow it to cure. Always follow the manufacturer's instructions for drying time, which can be up to 48 hours.

Be sure to check the grout you use before you apply the grout sealer. Sometimes, grout doesn’t actually need sealer at all. 

For the rest, apply one thin coat, clean up any excess mess, and let it sit for at least a full day. After a day has passed, go ahead and apply a second thin coat. Again, let that dry for another 24 hours.

Cleaning typically takes 1-3 hours, depending on the area size and dirt buildup.