How do I clean antique currency?

Here's two suggestions that I found. I would be very careful as it is probably pretty easy to ruin this and destroy any value that it might have. You can buy dish soap that has no coloring in it--look in the baby department at any local big box store. I don't know who you have been asking for your information about whether or not you should clean this currency. I would find an antique dealer who specializes in money and currency to ask. I don't think I would do anything until I knew for sure.

https://www.coins-auctioned.com/learn/coin-articles/how-to-clean-paper-money

https://ourpastimes.com/restore-paper-money-6968427.html

I second Gk's recommendation to ask an expert in antique currency. I used to work at an antique shop, and I know that with coins, cleaning them definitely reduced the value, and we could tell when they'd been cleaned.

I would suggest trying the sponge method on a newer bill to make sure that it works well. The dealer we have used suggested clear baby shampoo. It will remove oils and dirt without any bleach or coloring. Mix up warm soapy water and take a sponge, dampen with solution and gently apply from mid-bill to edge. Wear gloves while doing this to prevent additional issues. Repeat on the other side of the bill. Flip and do reverse side. So you are cleaning in 4 sections.

I was trying to see the year but can't. Would you mind replying? Just for curiosity. I have a few silver certificate and coins from the 1880's forward. Not a serious collector but I've held onto them as I came across them.

I agree with those who suggest talking to an expert in the field. Unless you're willing to take the chance of something going wrong. Have you got an estimate of its value?

Talk to an expert. It would be a shame to ruin it.

Current currency can take being left in one’s jeans pocket and run through the washer & dryer-

Not that my friend would do that! I’m just speaking to the quality of the rag paper & the inks.

I’m wondering if Aqua-Tabs would work? It’s a “home use” version of a chlorine dioxide tablet that is used to fumigate a room for smoke damage and surface mold damage. Obviously one doesn’t leave it 12” away from the source.

Xerophilic fungi produce rust-colored spots. Often seen on the pages of old books or antique linens, these freckle like spots called 'foxing' are the result of a melanin type exudate, not rust. Oxidative bleaching with hydrogen peroxide may reduce the color but will further weaken the cloth or paper.

There are things you can do yourself

https://blog.bookstellyouwhy.com/bid/230209/how-to-prevent-and-reverse-foxing-in-rare-books

but - it the currency is valuable consult with a pro.

There are shops that deal with money and currency, I would suggest you take it to more then 1 of these and get a consensus of opinion on it's value as is, and inquire if it would be worth it to clean it up and how to proceed.

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I would be worried that i would ruin this. For peace of mind and most likely a much better result take this to a pro.

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