Looking for Nitromors Woodstain Remover

Some years ago, I bought a product called Nitromors WOODSTAIN REMOVER which the label says "is ideal for overstained wood". It's a gel type product.

I have a pine door that is stained too dark so I tested the woodstain remover on a section and it's done a good job in removing enough of the stain to create a nicer colour.

However, I've not got enough left to do the whole door and I can't find it on sale anywhere.

Does anyone know of this product and if it is still around?
If not, is there something similar to it I could use? I don't know what it's active ingredients are but it is doing the job.

Thanks