Used stamps exchanges.

the least thing is to clean stamps of all media

This raises an interesting issue - as we all know, some self-adhesive stamps from some countries (Italy, Sweden, UK, US, Australia) are almost impossible to separate from paper without damaging them. Many collectors, myself included, keep these stamps on paper ... what choice do you have if you want to have all issues in your collection? I can't see the stamps on paper to which Laurent objects in the photo, but I have recently experienced myself that somebody is refusing to give me a 5 star rating because I included a small number of stamps on paper - recent self-adhesives from Australia which definitely fell within the category of "too difficult to separate from paper without damage". Very disappointing, especially because this was an experienced exchanger who should know better. I also note that sending stamps on paper does not appear to be against the rules of the club. So the question is - to send (and risk getting marked down) or not to send (and then getting criticised for not sending enough recent stamps)?

I put a note lower than 5? Nope

even if it means receiving very common stamps, in this case from Australia, I prefer not to have paper on the back
I just cleaned them

I had two nice 2022 stamps from Denmark from another exchange, yes I keep them on paper,

receiving stamps on paper is not a problem for me if they have been interesting from a philatelic point of view for 2 or 3 years

here is the difference

Je mets une note inférieure à 5 ? Non

quitte à recevoir des timbres très courants, en l'occurrence d'Australie, je préfère ne pas avoir de papier au verso
je viens de les nettoyer

J'avais deux jolis timbres 2022 du Danemark d'un autre échange, oui je les garde sur papier,

recevoir des timbres sur papier ne me pose pas de problème s'ils sont intéressants d'un point de vue philatélique depuis 2 ou 3 ans

voici la différence

I also kept on paper these 3 pretty stamps from Australia sent by a philatelist who will recognize himself, they will be placed like this in my album

https://zupimages.net/viewer.php?id=22/24/gsbt.jpg

here is the difference