From what i read about them, they were Ukrainians not PolesHello!
I have not encountered Poles in the SS, but there surely were other ways in collaborating. For instance, the infamous "Trawniki men", educated in Camp Trawniki (Lublin). Several Poles served in KZs, including Auchwitz.
The "Trawniki" men (one batallion), aside Polish police were there during the destruction of the Warzaw ghettos. Stroop mentions 4 officers and 263 men.
1500 Trawniki men followed the Wehrmacht during the withdrawal.
B.
Inb the same spirit many Ukrainians served as KZ guards. Never heard of poles doing that. The only exception applying there would be that there were Volksdeutche.....