Glass should be cleaned after edging and tempering for several reasons:

1. Remove debris and residue: During the edging and tempering process, small particles, debris, and residue can accumulate on the glass surface. Cleaning the glass after these processes will remove any unwanted particles, ensuring a clean and clear surface.
2. Improve optical clarity: Cleaning the glass after edging and tempering can improve its optical clarity. Any dirt, smudges, or streaks left on the glass can impair its ability to transmit light clearly, which can be especially important in applications such as automotive or architectural glass.
3. Avoid scratches or damage: Glass is susceptible to scratches, and any debris left on the surface after edging and tempering can scratch or damage the glass during handling or transportation. Cleaning the glass will remove any debris that could potentially cause damage.
4. Ensure safety: Clean glass is less likely to break or shatter than dirty or contaminated glass. Therefore, cleaning the glass after edging and tempering can help ensure its safety and prevent any accidents or injuries.

Overall, cleaning glass after edging and tempering is an essential step in the manufacturing process to ensure a high-quality, clear, and safe product.