How do I clean Roman coins

I agree with all of this. It might be helpful to add that aside from the top right coin (which I can't identify anything on) and the Gallienus coin, these are all clearly from the time of Constantine or later. If you can get clear pictures of both sides, we'll probably be able to help you a little more.

 

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Thank you for this. If nothing else I can use this as a starting point to compare to the photos of these coins and see if mine match. The photos I posted mostly show the best side, so the other side is probably difficult to make out. I need to try to clean these to make a better identification.

 

Do keep in mind that there can be a lot of variation in what can be considered the same "type" of coin. All of the dies used were hand carved, so even when you had the same person doing the same design (and there would usually be different people, sometimes of vastly different skill levels), there will be at least differences. Doug Smith has a page showing an example of this issue here.

I just wanted to point this out before you go straining your eyes over whether a certain coin matches a coin you find online exactly enough like I did before I knew what I was doing.

 

While we are at it, lets point out that Roman coins after the middle of the 3rd century were produced from several mints and each mint had its own particular style. In some cases the portraits of the same ruler just don't look anything like each other. In some cases the coins bore no mint marks so this style is all we have to separate the mints. Experts have not always agreed on the placement of some coins. While I am reasonably sure that the one coin is Gallienus, you may have to look at several coins before you find one with even a similar style. Add to that the fact that some rulers (including Gallienus) ruled for several years but unlike UK Queens, their portraits were updated as they went along so being able to recognize a face is a bit more complicated than laying two coins side by side and matching points. Here is a page illustrating a few (hundred) Gallienus coins that you might want to compare:
http://www.beastcoins.com/RomanImperial/V-I/Gallienus/Gallienus.htm