# 10W Lens has rectangular "smudge?"

**URL:** <https://forum.snapmaker.com/t/10w-lens-has-rectangular-smudge/35596>\
**Category:** Snapmaker 2.0 (3-in-1)\
**Tags:** Laser\
**Created:** [April 15, 2024, 9:21am UTC](https://forum.snapmaker.com/t/10w-lens-has-rectangular-smudge/35596 "2024-04-15T09:21:40Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![phil](https://avatars.discourse-cdn.com/v4/letter/p/e95f7d/32.png) [@phil](https://forum.snapmaker.com/u/phil)\
**Post date:** [April 15, 2024, 9:21am UTC](https://forum.snapmaker.com/t/10w-lens-has-rectangular-smudge/35596/1 "2024-04-15T09:21:40Z")

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Hello everyone,  
cleaning my machine at the moment and was wondering if any one else had noticed such a shape on their lens ? Is it a problem for focus or power ?  
I’m bit worried trying to clean it cause i have read about some mostly making it worse…  
Any help is much appreciated 🙂

 ![IMG_6465](https://us1.discourse-cdn.com/flex022/uploads/snapmaker/original/3X/f/3/f384e256fa5f6ea38decb460d58effb8ed944a03.jpeg)

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**Author:** ![xchrisd](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.snapmaker.com/xchrisd/32/1503_2.png) [@xchrisd](https://forum.snapmaker.com/u/xchrisd)\
**Post date:** [April 15, 2024, 11:08am UTC](https://forum.snapmaker.com/t/10w-lens-has-rectangular-smudge/35596/2 "2024-04-15T11:08:52Z")

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Have a look at this:

> [@Cleaning the Laser](https://forum.snapmaker.com/t/cleaning-the-laser/27535/6):
>
> I also run into deterioration of my 10W laser wood cutting performance. Suddenly, 3mm could not be cut properly anymore and the laser spot size obviously increases quite a lot. First, I thought it may had been caused by uneven wood plates with the focus being off or inconsistency of the hardness of the wood. But looking at the lens the reason was quite obvious. I cleaned mine by soaking a cotton swap in an [alcohol pad](https://www.aliexpress.com/item/1005004828873748.html) and wiped the lens clock-wise as described by the [user guide](https://s3.us-west-2.amazonaws.com/snapmaker.com/download/manual/10W_Laser_Module_EN_V1.0.0.pdf#page=41). This did bring b…

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**Author:** ![phil](https://avatars.discourse-cdn.com/v4/letter/p/e95f7d/32.png) [@phil](https://forum.snapmaker.com/u/phil)\
**Post date:** [April 15, 2024, 11:17am UTC](https://forum.snapmaker.com/t/10w-lens-has-rectangular-smudge/35596/3 "2024-04-15T11:17:37Z")

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Thank You !!!

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**Author:** ![Blauskink](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.snapmaker.com/blauskink/32/17834_2.png) [@Blauskink](https://forum.snapmaker.com/u/Blauskink)\
**Post date:** [April 15, 2024, 1:42pm UTC](https://forum.snapmaker.com/t/10w-lens-has-rectangular-smudge/35596/4 "2024-04-15T13:42:11Z")

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Hello Phil,  
The lens definitely needs to be cleaned here. Don’t worry, nothing can happen as long as you clean it as Snapmaker says, namely with this product (see picture).  
Take a cotton bud and dip it into the liquid. Now move it in a circular motion over the lens. Then simply wait until the liquid has evaporated.  
And the laser is ready for the next use!

 ![20240415_153738](https://us1.discourse-cdn.com/flex022/uploads/snapmaker/original/3X/f/c/fca215182cfa8d2ee106d9f17095b04b38397189.jpeg)

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**Author:** ![spucky](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.snapmaker.com/spucky/32/25910_2.png) [@spucky](https://forum.snapmaker.com/u/spucky)\
**Post date:** [April 15, 2024, 3:04pm UTC](https://forum.snapmaker.com/t/10w-lens-has-rectangular-smudge/35596/5 "2024-04-15T15:04:25Z")

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After a couple of hours operational the lens of my 10W module doesn’t look like that.

Snapmaker recommends to clean the lens at least once a week.