Just got done removing a badly cracked and shattered glass from an S3. There are a few small scratches near the top area where the glass was shattered the most. The scratches are very small but noticeable as they produce funny rainbow-y artifacts (noticeable when phone is close to the eyes/ on bright colours) when the LCD is on. Is there anything I could do to remove these scratches and/or stop these effects from happening?

Also what could I use as an alternative to isopropyl alcohol as its very difficult and expensive to get in the UK?

Thanks.