Except money laundering isnt literally washing money to "clean" it......
For those that don't know, money laundering is taking "dirty" money from illegal things, and then mixing it in with "clean" money from legal things so it all looks like it came legally. This is done by faking additional sales in a small business. Can pretty much be any business, but its easiest if its something low maintenance (not your main job so you don't want to have to spend all day managing it) needs to be a business with more labor than physical items (hard to say you sold 50 burgers when you only bought 12 patties, easy to say your laundromat did 50 loads and skimped on the detergent and only used 2 gallons) and it also needs to deal mostly in cash (you need to add all your "dirty" cash into it, so its best if the business already deals with a lot of it anyway)
Common examples are strip clubs, laundromat, dry cleaner, car wash, etc
An example of how it works, you sell a bunch of drugs and make $1000, you also own a car wash. Your car wash actually cleaned 40 cars and made $400, however you are going to add that $1000 you made illegally into it and say your car wash cleaned 140 cars and made $1400. You can then take that 1400 and do whatever with it, since it no longer looks like drug money. If somebody were to audit your business, its really hard to definitively say how many cars you actually cleaned. Its easy and cheap to use extra water, buy a bit more soap, etc.
Also there is the way people make fake money look real. They take a bunch of the new fake money put it in the dryer and add poker chips or smooth rocks the size of a quarter and set it on tumble dry. It ages the bills to look old, making it less obvious that the bills are fake.
For those that don't know, money laundering is taking "dirty" money from illegal things, and then mixing it in with "clean" money from legal things so it all looks like it came legally. This is done by faking additional sales in a small business. Can pretty much be any business, but its easiest if its something low maintenance (not your main job so you don't want to have to spend all day managing it) needs to be a business with more labor than physical items (hard to say you sold 50 burgers when you only bought 12 patties, easy to say your laundromat did 50 loads and skimped on the detergent and only used 2 gallons) and it also needs to deal mostly in cash (you need to add all your "dirty" cash into it, so its best if the business already deals with a lot of it anyway)
Common examples are strip clubs, laundromat, dry cleaner, car wash, etc