The TC Patriot is definitely the Ruger Old Army of single shot pistols, and is a super easy to clean design. Pull the wedge, remove the barrel and pump hot water in and out using a cleaning patch on a ramrod. Oil and put away.
They are very accurate but the deep rifling tends to blow patches unless you patch very tight. I like to use a .451 round ball with a .015" thick pillow ticking patch. .445 and a .020 cotton duck patch works well also.
From a sandbag rest, it can shoot cloverleaf clusters at fifty yards, or at least I have done it once or twice when I had younger eyes, using .451 balls and oiled denim patches.