[Renato1 (Renato)]

For cleaning eyepieces and camera lenses, I use,
a. A big blower to blow as much dust off as possible in the first instance, and
b. a camera lens cleaning kit consisting of cleaning fluid and a packet of stapled paper or tissues, which are supposed to be clear of anything that scratches(which is not necessarily the case with regular tissues).

I also bought eyepiece cleaning fluid and packets of stapled tissues from Orion, which was their answer to cleaning eyepieces, which in the end worked the same as the camera lens cleaning kits I'd bought locally.

After blowing, apply the tiniest drop to the eyepiece (don't flood it) then using a new tissue gently wipe from centre out to edges. Then using another part of the paper, fold it over to make an edge and get into the edges of the eyepiece and wipe that dried fluid off.

Alternatively, apply the drop of cleaning fluid to the paper and use that to clean less dirty eyepieces.

Isopropyl alcohol is the recommended cleaner for the front element of my 8" SCT, but it's the chemical version one has to get, not the rubbing alcohol type. And I use lots of those little tissues to achieve that.

I am very wary of using lens cleaning cloths. They should be okay initially, but will eventually accumulate particles that can scratch, which is why I always favour one use lens cleaning paper.
Regards,
Renato