I know this is a common cactus, but no clue as to what it's called?

This is probably a common one too, but no idea what it's name is?

Pilea
Ferocactus
Mammilaria longimamma

Ahyom. No problem soaking your Pilea 'Aluminum Plant' in soapy water.

Keep isolated from other plants..if, by chance, you set Pilea near neighboring plants before noticing mites, inspect daily, and no harm spraying them, too..Never hurts being cautious.

BTW, nice-looking plants..Love your Pilea..they're rare these days. Toni

That pilea is in my hessayon book, and one plant Ive long wanted to find.

Greenlarry - the Pilea cadierei is really easy from cuttings if you find someone who has one. Or there are some on ebay for 1.99.

Here is a link that might be useful: Pilea cadierei

Ill look for one in Wilkos. They often have small plants in tiny pots for sale.

Thanks everyone!

I like it too, looks similar to Coleus/Plectranthus.

Its a relative of stinging nettles!

I always learned this pretty pilea as Aluminum Plant. I googled that name and see that that is still the most accepted common name.