I’ve had the same issue when engraving clear acrylic. I process a lot of acrylic mostly clear but this happens on any color. I have a Boss Laser 20x14 with a 70watt tube. I reached out to them with pictures of the issue and they did basically asked me to tune the scan spacing. I got a feeling it’s got something to do with the air assist. I get different results with and without air and also varying the PSI on the compressor. I think these dots are engraving dust that sticks again to the material but I could be wrong. I’ve been having better results using the dish soap technique and engraving through it. Here’s some pics that I sent to Boss a while ago
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