Also called white spirit, is a mild solvent which is used in making latex clothing to prepare the to be glued parts for the next step. It removes oil, your pencil markings etc., everything what shouldnt be on there.

Heptane is a mild solvent which can also be used as cleaner. It finds its use as well as rubber cement thinner.

Take piece of cloth, dip it with the mineral spirit and gently clean the parts you want to glue together with the cloth. It might happen that the latex slightly bulge, but give it a few seconds and it will straighten out again.

If your latex sheeting got to much talkum powder on from the production, I recommend to wipe that at first of with a wet cloth and then use the mineral spirit. To make sure that you got it all and achieve strong seams.

Warning! The fumes of the mineral spirit are harmful! Make sure to have enough ventilation while working with it! In everyday use it causes skin irritation, wash your hands in between or wear a glove when often used. There are also Odorless Mineral Spirits available with less toxic compounds which are made for close and often work with the substance.