Is this mildly acidic cleanser really good?

Why does my skin feel slippery when I use a mildly acidic cleanser?

I just can't get used to it every time I use it. The alkaline foam cleanser I used to use left my face feeling squeaky clean and refreshed after washing, but with this one, no matter how much I rinse with water, that slippery feeling just keeps lingering. Ugh...

At first, I thought the cleanser hadn't been rinsed off properly, so I rinsed vigorously with water until my skin turned red, but I was baffled because the distinctive slipperiness didn't go away. I've heard that this slippery feeling is actually good because it contains ingredients that create a protective barrier on the skin, but perhaps it's just my imagination, but it feels unsettling because it seems like impurities or sebum weren't properly washed away and are still lingering on my skin.

I really need your advice.