Got new mentha after giving up on the last one (reasons can be seen in previous post)
I picked one carefully at different store and after one day I saw these white spots again, I don't know what to do,, I'm sure that it was clean, maybe I overlooked them.
The last one even after cutting didn't get better. Can you recommend some products please.

Hi again.
Same questions as before: is this indoors or outdoors, please describe the growing conditions, and please show a photo of the whole plant.

I don't think you need products, just correct the care and conditions. But we need more info.

Outside when the sun is shining otherwise inside.
Haven't watered it since I only got it yesterday (probably every 4 days)
I wanted to separate them, but it's impossible without ruining their roots

Pic

Sorry...
Slight blemishes=normal.

When you posted all those leaf pics, I thought you were attempting to root them.
Won't work, root the stem, not the leaf.

As far as the spots?
I can't see anything I'd be concerned about.

Natriy said: Pic

This is a prob...
The sooner you plant this thing... the healthier it will be.

I always like a nice dripping spigot...

Don't bother attempting to separate... just plant in the ground!

The leaves were cut of due to the spots, the first also started slightly and then escalated.
Should I get them bigger pot or leave them overnight outside too.? I can't plant them outside, winters here aren't weak

What planting zone are we talking about?
Mint hates being indoors. When I attempted growing mint indoors in winter climate... big fail.
Mint apparently grows in USDA Hardiness Zones 3-8

Zone 3a: This subzone has a minimum average temperature of -35°F to -40° F. Zone 3b: This subzone has a minimum average temperature of -30° to -35°F.

Does it get colder than -30 at your house?

Very hardy plant... But it does like plenty of water...

Yes, a larger pot is fine, they spread rapidly and no need to separate. Leave them outdoors. They like full sun mostly but welcome afternoon shade in the hottest months. Do acclimate them gradually to the sun at first if they've been in mostly shade.

Those first pictures just looked like older leaves, maybe a bit blemished from travel. Nothing to worry about.

How cold are your winters? My potted mints stay out in freezing temps but not extreme.

In my area it's around -5°C

just googled:
Based on the USDA Hardiness Zone Map, this interactive version covers the country of Czech Republic which ranges from Zone 6b to Zone 8b.

Plant the mint in the ground... will be fine.

Natriy said: In my area it's around -5°C

That's about the same as it is here at my house...

some years, it gets cold enough to kill the winter garden...

won't harm the mint.

Can you cook eggs on asphalt?

No asphalt at my house...
I cooked up a nice omelet this morning... but I used a cast iron fry pan.

Is it that hot where you are? If so, shade your mint during the hottest time of the day — doesn't need full shade just dappled like through tree leaves.

Not that much around 25° to 30°C this time of a year, just wanted to ask since it sounds like you are from a hotter place

My area has extremes and the sun is intense because of the 1.61k arid high-desert altitude, . It's 35C right now but it burns more than at sea level so I'm cautious with many plants. Your mint should be okay in your climate.