Best way to clean these?

[Bill Dye The Travis Guy]

Hello everyone, 

does anyone know the best way to clean these? I can’t sadly prep them with a sandblaster or air gun but I wanted to see if there is a way to dunk them in something? I’ve already washed them with soap and water and used a toothbrush. Any recommendations would be great!

[FranzBernhard]

You can try a high pressure washer on one of those. 

These hash plates usually do not much benefit from any kind of prep besides thorough cleaning.

Franz Bernhard

Edited January 29, 2023 by FranzBernhard

[Ludwigia]

I agree with Franz. And any kind of acid bath would just ruin the fossils since you have calcite and limestone there.

[Fossildude19]

Any kind of acid will likely ruin the fossils, rather than eat away at the Matrix.

Probably best left as is.

[Mark Kmiecik]

I agree. In my opinion you're done with prep.