Hello, I'm Dr. Deb.
I recently came online and see that your question hasn't been answered. I'm so sorry that you've had to wait for a response, but if you still need assistance, I'd like to help if I can.
There are a number of human, over the counter products which would be safe to use in his eyes which I'll list below. I wouldn't, however, rinse or flush the eye with a salt water solution since the salt could be very irritating.
Placing a warm wet tea bag on his eye may be of benefit though; a somewhat old-fashioned solution but one which works:)
The Systane products listed below can be used in dogs, but the ones with vasoconstrictors, such as naphazoline should be avoided. These products are labeled as "taking the red out" or for "red eye".
Tears Naturale Nighttime
Systane Ultra lubricant sterile eye drops
Advanced Eye Relief Nighttime
Akwa Tears ointment
I hope this helps although, again, my profuse apologies for the delayed reply. Deb