How can you effectively and relatively safely clean the sink itself? After all, from the seabed we get it all in silt and algae, with a limestone coating ...

Initially they are

And we want to have

Plaque on the shell dissolves perfectly in vinegar. You can lubricate the rapana with vinegar essence (70%), rinse with a brush after ten minutes. And you can soak in vinegar for several hours and also clean with a brush.
Be very careful with vinegar! The shell dissolves in it! You need to carefully monitor the reaction and wash off at the right time!

Another method that was found on the World Wide Web is to soak in a chlorine solution. Keep it for so long until the top coating from the shell begins to rub off with your fingers.

I have personally tried both options.
1. I don’t have vinegar essence, I just poured vinegar into a jar and put a shell there, after 3 minutes it became a hole). It became interesting to me and I didn’t get it, the upper curl just melted before my eyes in a couple of minutes! An amazing sight, just magic, I advise you to watch) After all, the shell is very thick and durable, but then it just disappears ..

2. I soaked the shells in a domestos solution. They lay there for 4 or 5 days, the top layer (and they were very dirty !!) dissolved, rubbed off, as promised. But! After drying, the shell became like white paint painted....
I think that if you open it with varnish, the color will appear ...

As for the shells, an even bigger problem is to clean it from the inside. One way or another, a shell is a living creature, and if you get it from the bottom, it often deteriorates and an unpleasant smell appears.

To be honest, I don’t know the upper part, I have never had to clean it, but I have come across the inside. In the summer, when we rested in a camp by the sea, we put the found shells in an anthill for a couple of days. They ate away the entire inside and we only had to wash it well.

Now the following methods are still known, though I haven’t tried the last one:
1. Using a special knife (a long process, I tried to do it with an ordinary knife).
2. Freeze the whole shell, frozen meat comes out well.

There were no problems with getting the insides at all, but with the consequences ....)
They boiled shells for me, but the inner surface cracked a little ...
They say that after freezing everything really separates well ...
But those who caught shells did not know the last way ... Now I have cleared the rapans of moss, they are so white and clean ... BUT they stink terribly!
Moreover, half of the shells themselves do not have rapans inside, but they all stink ..
The smell clearly comes from the outer ear of the shell, which is near the entrance, it is large and mussels lived in it, and they stink ... it’s impossible to get them out of there, no matter how I use knitting needles, an awl and tweezers.

Here are my rapanki lying on the street, in the rain for a week, but still smelly, I feel that they won’t get into the house (

Sister advises to open with varnish, and just pour varnish into those smelly ears to block the smell, how do you smoke, something will come of it?