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Double Bass Removing rosin from upholstery?

chat gpt says:

To remove melted double bass rosin from upholstery, first freeze the rosin by placing ice cubes on it or leaving the item in a cold environment to make it brittle, then scrape off the solid chunks.

For the remaining residue, use an organic solvent such as turpentine, paint thinner, or odorless spirits to dissolve the tree-based resin. Test the solvent on an inconspicuous area first to ensure it does not stain or damage the fabric fibers.

  • Mechanical Removal: Freeze and scrape before applying liquids.
  • Solvent Choice: Turpentine or paint thinner are effective; avoid petroleum-based products like lighter fluid which may stain.
  • Safety: Always test solvents on hidden areas and avoid getting chemicals on instrument varnish if cleaning a case.
 
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Has anyone ever seen ChatGPT and @Don Kasper in the same room?
Oh. I thought they were the same person.

:D

Seriously and more on topic, was this melted cake rosin? Or was it rosin dust from a bow? Synthetic, natural fibers, leather or naugahyde? Also, will the upholstery material detach from the main object, like a cushion cover from a couch?
 
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My first approach would be hopefully the least invasive -- cool and then gently try to chip off what remains of the melted chip, then very quickly vacuum the little bits and pieces of rosin off so they won't stay around, warm up and re-infect the material. Rosin chips can be sharp so being really gentle with the material in this process would be important. I might try a plastic spoon to gently break up and chip away the cooled rosin.

If there's anything of the rosin left after this, something with alcohol, like rubbing alcohol, would be my next effort, but I'd do a test run on a less visible part of the upholstery first to make sure that alcohol doesn't damage the material. As you're aware if you've followed the efforts to rejuvenate rosin cakes, direct contact with rubbing alcohol will thin, degrade and liquefy the rosin, but afterward, how to wick off the rosin liquids is going to be tricky. If it were me I'd try applying the alcohol with a small piece of paper towel and then use a dry paper towel to try to wick the rosin liquids off.

Talking with an upholstery business first might be smart, but upholstery cloth contacts with rosin are probably pretty rare. Might be worth a try though.
 
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Last time i did it, I used this tool from my kids' pencil cases:
1784112871368.png

The needle end, of course. Gently, and stop in the right moment.
(I agree that cooling the sofa seems a good idea. I'd put the ice into a bag though.)

Using any chemical cleaner will likely show that the cleaned area is now shining with beauty, rendering the rest of the already nicely aged sofa really dirty. Then, you will have to clean the whole sofa. How do I know it so well, do you ask? ;-)
 

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