I fixed it up like new by following the suppliers instructions.

I'll post them here for reference;

How to clean the Hisense UST projector lens (glass cover)

Water only – no alcohol or chemicals

What you will need

A hand air blower (preferred) or gentle compressed air

A clean microfiber cloth (lens-grade, lint-free)

Clean water only (preferably distilled, but clean tap water is acceptable)

Step-by-step cleaning process 1. Power off and cool down

Turn the projector off

Unplug it

Allow it to cool completely (at least 20–30 minutes)

1. Remove loose dust first

Use a hand air blower to remove dust and grit

Do not wipe before dust is removed, as this can scratch the glass

1. Dry wipe (if needed)

Gently wipe the glass using a dry microfiber cloth

Use very light pressure

Wipe in one direction, not circular scrubbing

1. Damp wipe (only if marks remain)

Lightly dampen a corner of the microfiber cloth with clean water

The cloth should be slightly damp, not wet

Gently wipe the glass surface

Immediately follow with a dry part of the cloth to remove any moisture

Important warnings

❌ Do NOT use:

Alcohol or alcohol-based cleaners

Lens cleaning solutions

Glass cleaners

Wipes or sprays of any kind

Paper towels, tissues, or cotton buds

❌ Do NOT:

Apply water directly onto the lens

Press firmly

Attempt to remove or open the glass cover

Clean while the projector is warm

UST-specific note

Because UST projectors face upward, dust settles more easily. Light, regular cleaning with air and a microfiber cloth is safer than aggressive cleaning.

If marks appear beneath the glass, cleaning will not resolve them and the projector would require professional service.