try filling your tank with hot water, leave it there for 24hrs.... all hard spots will be easy to take off with a soft sponge... if it is still rough keep water inside your tank and use a heavy duty mag float.. (magnet cleaner)
it will be alot easier for you bro... thats what i did with mines


it will be alot easier for you bro... thats what i did with mines















They were in your house for a few days?