I honestly have no idea what to do after combining the water bucket, "special" soap, and sponge together. I don't see any of the titular mysterious gelatinous substance anywhere (Ohhh, I needed to turn the lights off first!) meeting the mysterious blue light, and I can't interact with the safe upstairs nor the door on the staircase (the later only makes V say "beautiful door"). Oops, I just needed to solve a couple of puzzles first!
Now, how do I bend the paper clip...?