Vase with hard water marking

Hi, can any body make suggestions for cleaning a vase which has a cloudy effect inside as though it has had hard water in it for ages. It may well have done, it was cheap in a charity shop now we know why!!
We have already tried descaler, left it in for 2 days, Vinegar, shaking it with sand and water in it.
It is a narrow fluted vase and not easy to get any decent scourer in (hence the sand and water attempt) We are reluctant to risk putting it in the dish washer.
It's a fairly close match for one we already have and would look good one at either end of the sideboard with a few carnations or roses and a bit of gypsophila.

 

Mike,I don't think the glass will clear other than with repolishing. My Art teacher used to swirl 'glass paint' around the inside of jars etc to give a pretty effect and that would match yours up I reckon.

 

In the old days, we used to use lead shot with some soapy water to clean inside decanters. It was very effective. You can get lead shot from a fishing tackle shop and I think nowadays you can get ceramic balls from a catering shop that will do the same thing.

 

I think lead shot's banned nowadays, MMD - swans were harmed by ingesting it. I think they use titanium now.... I've also been told that Steradent tablets sometimes work if you use three or four at once. I suppose it depends if the cloudiness is caused by a deposit on the glass or damage to the surface.
You can get stuff which is supposed to stop dishwashers damaging glass now. I shouldn't think a single wash using a glass protector would do much damage - if all else fails!

 

Try neat lemon juice Mike and leave it for a while soaking

 

That's a lotta lemons, Walnut!!! Have to send an urgent request to LoL - maybe she's got lemons as well as oranges!!!

 

Already tried Vinegar Marley, left it soaking for 24 hours plus.
@ Pal, it is on the surface, not eaten in cos we can s****e what we can reach with a knife blade, it's just tall and narrow so we can't get the knife blade in very far.
Our next try will be the Steradent, somehow doubt lemon juice in this case, having tried vinegar and descaler which are both acids that usually work on scale, however if the Steradent doesn't do the trick we may stock up on Lemons at the weekend.

 

soda crystals, perhaps...?