How do you clean your lab glassware after formulating with sunscreens?

This has been a difficult job that takes several days... It looks like powdered ingredients as Parsol (TX and ZX) once heated stick to the glass and become extremely problematic. I can't clean the containers easily, the remains of the formulation hardens and even when I heat water to make the glass hot, it takes a lot of time to clean because the residues spread through all the glass, leaving a white trail that makes me really mad. :pensive:

The only solution I found was to leave the container immersed in water for a few days until the detachment becomes easier, but I think there must be a better way to solve this. There needs to be. :sweat_smile:

Thank you in advice! :blush:

Comments

  • EVchemEVchem Member
    edited June 10
    You could try doing an oil rinse and then following with alcohol/ surfactant. Or maybe invest in a sonicator / an ultrasonic jewelry cleaner
  • EVchem said:
    You could try doing an oil rinse and then following with alcohol/ surfactant. Or maybe invest in a sonicator / an ultrasonic jewelry cleaner
    Thank you! I did it with Sunflower oil (Helianthus Annus (Sunflower) Seed Oil) and LESS (Sodium Laureth-2 Sulfate) together and to finish I used a type of paper towel to remove the rest of the sunscreen formulation. It worked out well and made my job a lot easier, very very thank you!

    Anyway, sunflower oil maybe wasn't a good choice, I just did it for testing. Do you have any recommendations for a cheaper oil to use instead?
  • Bill_TogeBill_Toge Member, Professional Chemist
    in my experience, solvent degreaser (a mixture of petroleum spirit and oil-soluble poloxamer) followed by alcohol spray is an excellent way to shift water-resistant residues
    UK based formulation chemist. Strongest subjects: hair styling, hair bleaches, hair dyes (oxidative and non-oxidative) I know some stuff about: EU regulations, emulsions (O/W and W/O), toothpaste, mouthwash, shampoos, other toiletries
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