Lab marker for labelling cell culture plastics?
This is hardcore going to come across as a SPAM answer, but I simply did a Google search:

Laboratory Marking Pens from Ted Pella



Statmark Pen™: resistant to formalin, ethanol isopropanol and xylene

Secureline® Marker: water resistant; autoclavable; not suitable below 0°C (32°F)

Secureline® II / Superfrost: resistant to xylene, ethanol, acetone and formalin; service temperature -15°C to 100°C (5°F to 212°F)

You can try a Sample Pack of all 3 for $8 USD to see which you like the best.