Generally, tattoo shops will have tattoo washing service.

But it should be noted that,

It's best not to go to the hospital to wash, the power is too high,

It is easy to leave scars, and they are usually trained and washed in tattoo shops.

It takes about 3-4 times, with an interval of 2 months.

But it won't be cleaned thoroughly, because tattoos can't be washed away.