Grout / scrubbing brush recommendations please

[feelingrubbish2023]

Am trying to clean up the grout in the bathroom. I bought some wire brushes from Amazon and tried using them with white vinegar solution (as recommended by a friend) but it didn't make any difference. I bought a scrubbing brush from Tesco but it just seems too soft.

Any ideas where I can get a really firm old fashioned scrubbing brush to clean the tiles and grout up please. And recommendations of what to use.

Nail brush?

Something like this?

Home Tile & Grout Brush - Shifts Grime and Mildew amzn.eu/d/4VGFsCd

An old toothbrush and a weak bleach solution work perfectly. I do it every few months when my grouting gets grotty.

Yes I just use an old toothbrush, it does the trick. (The grout in my bathroom gets really foul, in case you’re wondering! But a toothbrush is enough.)

I have white grout and I always spray it with cilit bang black mould remover, spray generously, wait 30 minutes, give it a light scrub with a scourer and rinse, comes up sparkling.,

I use a denture brush and cif cream.
And then spray with mould and mildew remover

For grout this is amazing Fuginator® Grout Brush, Grey / Orange, Innovation from 100% Recyclables, Household, Patented and Certified with Blue Angel amzn.eu/d/bi4uDMd