The shower had a thick orange mucus-like coating building up. This isn't the result of a missed day of cleaning, more like months and months without a scrub brush having made contact with the tile.
Out of curiousity, I grabbed a towel and ran my finger through the muck. It came off as easier than the homecoming queen's gown.
Below are pictures of before the wipe, where I left a trail of clean, and the towel with its orange mucus stain.
You'd think a daily scrub down of a shower would be common practice for a gym. But apparently not this one. Its filthy!