Deep Interior Detail: BMW M4 CS

We recently had a BMW M4 CS in the studio for a full interior deep clean, and it's exactly the kind of job we love getting our hands on. The car was in decent condition overall — no major disasters, no bad smells or stains — but like most daily-driven performance cars, it needed a proper refresh to bring it back to the level it deserves.

A car like the M4 CS has a lot of surfaces that get overlooked in a regular clean: Alcantara, carbon fibre trim, stitched leather, and tight factory gaps that trap dust over time. Jobs like this are less about scrubbing hard and more about using the right product and the right tool for every single surface.

Breaking Down the Interior, Panel by Panel

We don't just spray everything down and wipe — a proper interior detail is broken into stages, working from the top down and from dry to wet.

Dry Debris First Before any product touches the interior, we go through with the vacuum and a Tornador air gun to blow out all the loose dust, sand, and debris hiding in vents, seat rails, door pockets, and stitching. This step alone pulls out an amazing amount of grime that would otherwise just get pushed around once you introduce chemicals.

Brushes and Detail Tools Every M-car has tight, awkward spots — around the carbon trim, badge stitching, seat bolsters, and buttons. We use a range of small brushes and scrubbers matched to each surface, soft enough not to scratch trim or leather, but effective enough to actually lift dirt out of the texture rather than just pushing it around.

The Chemicals: Matching the Right Product to Each Surface

This is where having quality gear really matters. We used a mix of trusted brands for this job, each one selected for the specific surface it was working on:

• Gyeon interior products for a safe, effective clean on trim and general surfaces without leaving a greasy or overly glossy finish.

• Koch Chemie for tackling more stubborn buildup, particularly around high-touch areas like the steering wheel, door cards, and console.

• P&S for leather and fabric care, giving a clean result without stripping the natural feel of the materials.

• Bilt Hamber for a genuinely deep clean on carpets and mats, lifting ground-in dirt that regular vacuuming just can't reach.

The Finish: Korean Microfibre Towels

For the final wipe-down and buffing stage, we finish everything with premium Korean microfibre towels. These are noticeably softer and more absorbent than standard towels, which matters a lot on Alcantara and soft-touch plastics where the wrong towel can leave lint, streaks, or micro-scratches. It's a small detail, but it's the difference between a clean interior and a genuinely finished one.

The Result

Once everything was cleaned, conditioned, and buffed, the difference was obvious — not a dramatic before/after like a neglected car, but the kind of result where every panel, seam, and material feels genuinely clean rather than just wiped over. That's really the goal with a car like this: bring back the factory-fresh feel without masking anything with heavy fragrances or coatings that don't last.

If your car's interior is starting to look tired or you just want it brought back to a proper factory-fresh standard, this is exactly the kind of detail we specialise in.

Want your interior looking like this? Book an interior detail with HAXS and let's get it sorted.