Well, we are remodeling our bathroom, and we have old hard caulk that is about 12 years old that we CANNOT get scraped off the edge of the bathtub. Does anyone know what we can use to soften it to help remove it? It'* making my dad pretty pissed off because he has been scraping at it for 20 minutes with no luck.

what is the bathtub made out of and are you trying to save it?

you tried heat?

Yes, the bathtub is a ceramic coated cast iron tub original to the house (built like 1959). We cannot remove it as it requires ripping part of the wall out. So we cannot ruin the tub.

i got this little tool from home depot lowes builder square nope wasnt there cause they closed long ago.. but its a grout scraper.. and you just rub it back and forther and it removes all the old stuff... its out in the garage if you would like a pic of it.. but it worked for me... and was only like 5 or 6 bucks too

Got a dremel tool?
http://www.mytoolstore.com/dremel/grout.html
Worked great at my last house

There isnt much you can do except give it hell. Like stated above a good scraper is very usefull but it'* still time consuming. if you go to a hardware store I would recomend a "five in one" it is a tool made for painters but is all around usefull.

they make a product to remove old caulk. its a cream that gets applied over the old caulk and it says it softens it