# Optical glass issues **URL:** \ **Category:** General Discussion\ **Created:** [February 15, 2018, 5:13pm UTC](https://forum.formlabs.com/t/optical-glass-issues/17428 "2018-02-15T17:13:33Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Olivier\_Suire](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/olivier_suire/32/10327_2.png) [@Olivier\_Suire](https://forum.formlabs.com/u/Olivier_Suire)\ **Post date:** [February 15, 2018, 5:13pm UTC](https://forum.formlabs.com/t/optical-glass-issues/17428/1 "2018-02-15T17:13:34Z")
I recently realized that for some reason, there was [a sort of haze](https://photos.app.goo.gl/ectmGjCF7O8oqL002) on the underside of my optical glass. I reached to the support to get the procedure for cleaning it, and here’s what I found : the cleaning of the underside of this glass is incredibly difficult because of the glue holding the neoprene joint. That glue gets dissolved even by the tinyes amount of IPA makes [smears from hell](https://photos.app.goo.gl/8gO2kULut89G8fTJ3) which I never could totally get rid of. I think that the design could be improved The joint should be glued to the machine, and the glass should not have any metal frame : it should just be held in place by clamps + screws. It would probably bring the cost down, and make the glass easier to clean, and eventually a cheaper part to replace, because yes : at some point, this thing can get un-cleanable, no matter how much time you take, and how many pec-pads you use ! ---
**Author:** ![adriantanner](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/adriantanner/32/12886_2.png) [@adriantanner](https://forum.formlabs.com/u/adriantanner)\ **Post date:** [February 16, 2018, 6:10pm UTC](https://forum.formlabs.com/t/optical-glass-issues/17428/2 "2018-02-16T18:10:27Z")
**This is certainly not official procedure,** but if you don’t want to use IPA and avoid the gasket, try using hot water and regular dish soap. Scrub gently with your fingers for a minute or so. Blow dry or wipe droplets away with an absorbent soft cloth that will not scratch the glass/coating. This has worked well many times for me. Make sure the glass and foam are both completely dry before putting back in your printer. ---
**Author:** ![Olivier\_Suire](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/olivier_suire/32/10327_2.png) [@Olivier\_Suire](https://forum.formlabs.com/u/Olivier_Suire)\ **Post date:** [February 16, 2018, 6:58pm UTC](https://forum.formlabs.com/t/optical-glass-issues/17428/3 "2018-02-16T18:58:13Z")
Hi Adrian, I’ll try your method for sure. In despair, I must admit that I even tried the old “spit and rub” technique 🤐 ---
**Author:** ![adriantanner](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/adriantanner/32/12886_2.png) [@adriantanner](https://forum.formlabs.com/u/adriantanner)\ **Post date:** [February 16, 2018, 8:37pm UTC](https://forum.formlabs.com/t/optical-glass-issues/17428/4 "2018-02-16T20:37:44Z")
😭 ---
**Author:** ![Alisa](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/alisa/32/12600_2.png) [@Alisa](https://forum.formlabs.com/u/Alisa)\ **Post date:** [June 13, 2018, 5:33am UTC](https://forum.formlabs.com/t/optical-glass-issues/17428/5 "2018-06-13T05:33:55Z")
Can I use this [dish scrubber](https://www.cfone.net/scrubber.html) for scrubbing? Or I can only use my finger for that? ---
**Author:** ![arusso](https://avatars.discourse-cdn.com/v4/letter/a/a183cd/32.png) [@arusso](https://forum.formlabs.com/u/arusso)\ **Post date:** [June 13, 2018, 4:05pm UTC](https://forum.formlabs.com/t/optical-glass-issues/17428/6 "2018-06-13T16:05:44Z")
Hi @Alisa, have you tried using the [PEC PAD method](https://support.formlabs.com/hc/en-us/articles/115000016204-Cleaning-the-Glass-Optical-Window) yet? These are made for optical surfaces, and I’ve personally had good luck with these 🙂 I would stick to this or - in a pinch - to @adriantanner’s suggestion of soap, your finger, and a soft cloth. ---
**Author:** ![drp34](https://avatars.discourse-cdn.com/v4/letter/d/e99b99/32.png) [@drp34](https://forum.formlabs.com/u/drp34)\ **Post date:** [June 22, 2018, 4:37pm UTC](https://forum.formlabs.com/t/optical-glass-issues/17428/7 "2018-06-22T16:37:44Z")
If you’re using your Form 2 for work, I would just buy a new optical window. They’re only $60. If you’re using at home, then yeah it might be worth a little time to try and clean.