My little tort had something in his eye for a couple days and I got it out by dripping warm water on his head to soften it up and used tweezers to pluck it out
Contact lens solution is a mild saline/cleaner formulated to go into eyes, and clean-off protein buildup on the contact lens. It will dissolve mucus and re-wet the eye with a sterile liquid. If some gets in the nasal passage etc, it further helps rewet and clear that bit of the upper respiratory tract (from the nostrils to the inside of the mouth). It works very well.
I guess you are asking me about the contact lens solution? You could buy Wardley's turtle eye drops, but Bausch and Lomb sterile solution is people safe, which is a higher QC standar than what is used for animal products.
Odds are you may have some already, and for 'safe' I have used it on the few occasions a tortoise got something in its eye, and was wiping with a forefoot. The tortoise seems to not care, and I imagine the relief from irritation is well received.
Researchers use a 'sterile saline' to get cultures of nasal passages fro tortoises frequently. The contact lens solution has enzymes to make discharge dissolve and rinse away more readily.
On the rare occasion a tort gets something in its eye I find it safe. I would not use it daily as would be the case for people, we tear at-will almost, torts don't have that capability.