It's a matter of determining the correct terminology in the context of where you can best, and most easily, find the appropriate materials. If I can do this as a non-Italian speaker who has never been to Italy in order to help someone in Italy successfully find solvents it would seem likely that anyone with a modicum of wits can do the same in Spain too.
You might want to look not only at builders' merchants and DIY stores but also furniture restorers and artists' suppliers, for example. If you're feeling adventurous, getting hold of ethyl acetate from a 3-D printing supplies might be fruitful.
If your search raises any more specific questions, I'll be keeping an eye out for them and will be happy to assist.
What materials do you think you might need? Everything you might need to know for just about any variety of extraction method can be found here, so have a good dig in and look around. Quite a lot of the most useful threads are stickied at the top of each subforum, and there is a
wiki where much of the relevant information is gathered.
For more of a real-time interaction, we also have a
chat where you stand a reasonable chance of meeting some of us out there in the ether. A lot of the action tends to happen at times less convenient for Europe though, so you might need to be a little patient.
Welcome to the Nexus, good luck with your search!