How to clean ancient european bronze coins

[coinhound1983]

Need help pls. Have 20 bronze coins from bulgaria my friend is shipping to me from Germany. I've never cleaned my own coins before but I think these are caked with dirt and kind of busted up. What the best way to bring out the detail for something like this?

 

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[Silver Searcher]

We need to know just how old the coins are, and what we are up against, best to post pictures when you have the coins.

Ss

 

[coinhound1983]

Kk, I'm having them picked up around 8pm central time.. Will post ASAP

 

[coinhound1983]

Heres a coin I bought on eBay from a reputable seller on he had stated that his were found in Bulgaria as well and were professionally restored, I did this because my friend is getting to MD Europe and I'm stuck in SE louisiana so I got the fever of ancient coins. I do not know if this is actually a reproduction or not. If this is a real coin, I guess I'd be expecting something like this but still caked.

 

[Silver Searcher]

if you are going to buy Roman coins, go for the as dug, not cleaned.

SS