Mask: wash every day with unscented liquid soap and water, especially to get the oils off the seal and get the smells off the inside. But I like the idea of unscented/antibacterial baby wipes. Tube: every other day or so by placing the connection tube over the faucet filter. Just run some warm water...

After a couple of days, I looked at the data on the SD card again (using OSCAR). All the detail data is now there since I put the SD card in.

I was using a Dreamstation with mixed results. So far (for me) the Resmed is doing a better job (AHI consistently lower). Resmed seems quieter.

I recently got a new Resmed Airsense. It didn't come with a SD Card, but it does connect to a cellular phone network. I don't know which network it uses. It shows only 1 bar but that seems to be enough. Using a cell network instead of wifi is simpler, but if you don't have cell service where you are...