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To remove wood pitch, use mineral spirits (paint thinner). It's safe to use on most everything, but you should test it to make sure it won't leave a mark. The easiest way is to put some paint thinner in a spray bottle and spray it on the pants. It should soften up the pitch and allow you to wash it out.(You might need to retreat the area until the pitch thins enough to remove.)
Before you put the clothes in your washing machine, wash out the thinner with plenty of soap and water. It's greasy, but it will wash out. Once all the thinner is gone, you can wash it in your machine like you normally do.
Thank you, you saved the day.
I will try this as I just moved fire wood and could have distroyed a good pair of jeans.
Paint thinner worked like a charm! Pitch softened and I was able to scrape it off the clothing with a knife.
"wash out the thinner with plenty of soap and water"
that's WAY easier said than done. thinner has a strong odor and spread to other clothes and the washing machine.
I knocked over a bottle of thinner onto a pile of clothes on the basement floor.
a dozen washes later I'm finding there is not magic bullet