This is my “burnt” SPD cleaning SOP
- Warm boiling flask in mantle to about 80c
- Add a citrus based surfactant to the boiling flask and soak for 1hr.
- Scrub boiling flask with a good beaker brush
- Repeat 1-3
- Clean and rinse with isopropyl
Or if you have a sonicator
- Submerge glassware in a citrus based surfactant and sonicate for 1-3 hours at 80c
- Rinse with isopropyl