When to warrant replacement

Hello all you pros out there, another noob question. I have all my wheels apart and I've started cleaning stuff up with the wire brush on the grinder. I'm looking at my spacers, and axles especially, and they seem to have some marks, small cratering, lines, etc. on them. I've attached some photos for you guys to have a look. The rear axle is the worst for sure, and the dark colour on that one is just because I haven't hit that one with the wheel yet, but You can definitely see the issue spots though. If I need to replace the axles that's no problem I guess, but I hope things like spacers and such are ok with some imperfections as that would be hard to find replacements. I often wonder how on earth this bike was ridden at the end of its days lol.

thanks for the help
Rob

 

Good enough for me! Thank you