mask reconditioning

I have swift fx nano and its not that old but I really like it ,the silicone material that is the mask itself seems to be stretching just a wee bit ..was wondering if theres some way to recondition it .I have heard some putting them in boiling water for a minute or two but I didn't want to do that until I heard from others.

Thanks

PS-I hear there not making this mask anymore

Does that mask not have a replaceable cushion like most of the others? Strange! Do you use appropriate wipes to clean it? I find they often help to tighten it up a bit too.