For many years, my website has been wrongly filtered by Safesearch. Nothing I did fixed the problem. Even trying to communicate with Google via webmastertoold/re-inclusion request got me nowhere. A couple of WW thread on the problem here (including mine)...
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Worse still, my site was being completely filtered from the normal websearch results by Safsearch 'strict'. This eliminated traffic I was getting from people surfing from work, as many corporate LANs have the safesearch strict cookie enfoced on their entire network.
It's caused me a lot of frustration over the years, and sometimes despair at the traffic I might have been losing...
Finally, I've got it fixed. The only way to communicate with Google over the problem is via the Google forums at Webmaster Central. The Google employee you need to approach is Susan Moskwa, and she's a regular poster there. If your site is genuinely clean, she will do her best to help you by liaising with her colleagues on the Safesearch team.
As far as I can tell, my site is finally free of the Safesearch filters. What a relief!