Hi.
I use L'Art du Son, and have had wonderful results with it.
I only mix a single liter at a time so I don't have to worry about it going bad.
Transfer a small amount from that 1 liter to a small bottle (50ml?)
I use that to "coat" the records with.
I store it dark as light will adversely effect it.
I do a soak with the cleaner for 4 min. Vacuum it off. Soak again for 4 min, scrub with one brush, and vacuum off. Soak again for 4 min, scrub with a new brush, then vacuum off.
Then, I do three rinses using different brushes, vacuum between each rinse and set aside to air dry any residual water before sleeving in fresh anti static sleeves
P