I use Sorbo at times.
The rubber seems to be a soft rubber and is long lasting.
On certain glass the rubber is brilliant but it does not seem to suit some glass.
I havn't quite figured it out yet.
If you are fanning keep the overlap to a minimum.
The Australian Baron rubber fits Sorbo channels, it has 4 usable edges and works well.

Been using fairy.  sometimes l5 from lidl.  Where do you get this australian rubber from that fits the sorbo channels ?

Cheers mate will have a look.

your  doing insides  am i right ?  this problem probably  occured  when the heater is  on.. am i right ? and the heating was  quite  warm    right ?  and  you stripped  down  to your  polo shirt  right ?  LOL

  i  had  the same  problem ,, so your  not alone. i think its the soft rubber   from sörbo .. ive  tried  everything . the  best thing ive   found  is  to whip out the wagtail and use  that .------ the wagtail is  excellent  for   squeegeeing in  such  places  where the  heating is  very  high   and  that occurs .. the heater was underneath the window maybe  ( here  they  have  a lot  under  floor  heating ) and  where the sun is  shining like a bast.....this happens  to me  maybe   1  in 100 homes...  and i find the  sörbo works  great for the 99% of  homes  but  i always  seem  to have  problems  by the  remaining 1 %.. but thats  not   aproblem i dont get my knickers a  twist i just whip out   Mr Wagtail. and thats  the problem  gone. and   i use  cool water  from a  water bottle  for the squeegeeing !  this where the  Swoop  from   wagtail will come into its  own  hopefully !