Choosing a straw cleaner brush depends on your straw size and material.

• Bristles: Nylon bristles are common for everyday buildup; silicone bristles feel gentler on soft or silicone straws.
• Core: Look for a flexible stainless steel or coated core that can navigate bends and narrow tubes.
• Size: Pick a diameter slightly smaller than your straw’s inner opening. Standard lengths are about 8–10 inches; extra‑long styles reach deep bottles and tall tumblers.
• Sets: Multipacks include several diameters for kids’ straws, smoothie/boba straws, and everything in between.

You’ll find straw cleaning brushes and combo bottle‑and‑straw kits on Walmart, with options for pickup or delivery in many areas. Matching the brush to your straw can make cleaning easier and help reduce wear.

Here’s a simple routine that can help keep reusable straws clean:

1. Rinse right after use to reduce dried residue.
2. Soak in warm, dish‑soap water for a few minutes.
3. Run a straw cleaning brush through from both ends, twisting as you pull to loosen buildup.
4. Rinse thoroughly with warm water until no suds remain.
5. Air‑dry upright so moisture can drain and the inside dries fully.

For lingering odors, a brief soak in a mild vinegar solution can help. Avoid harsh abrasives that could damage finishes. Results can vary based on the drink and straw material, so adjust contact time and brush stiffness as needed.

If you don’t have a straw brush handy, these workarounds may help:

1. Fill the straw with warm, soapy water, cover the ends, and shake to loosen residue.
2. Try a gentle fizz: add a little baking soda, then top with diluted vinegar, letting bubbles work briefly before rinsing.
3. If the straw is marked dishwasher‑safe, run it on the top rack to supplement manual cleaning.
4. As a temporary fix, thread a clean pipe cleaner or floss threader through to sweep debris.

Rinse well and let the straw dry completely. These methods can help in a pinch, but a dedicated straw cleaning brush generally reaches farther and provides more consistent results over time.

Mold can be stubborn, but a careful clean can help:

1. Soak the straw in a diluted white vinegar solution (about 1:3 vinegar to water) for 15–30 minutes.
2. Scrub the interior with a straw cleaning brush, moving from both ends.
3. Rinse thoroughly with warm water until no odor remains.
4. Dry fully by standing the straw upright or laying it on a rack with airflow.

Tips: Check care instructions for your straw’s material before soaking. Avoid mixing cleaning chemicals. If staining or smell persists, it may be safer to replace the straw. Regular drying and occasional vinegar soaks can help reduce future buildup, but effectiveness can vary by use.

Getting the right fit makes cleaning easier and gentler:

• Diameter: Measure the inside of your straw and choose a brush just slightly smaller so bristles contact the walls without forcing.
• Length: Around 8–10 inches suits most tumblers; extra‑long styles reach tall water bottles.
• Widths: Narrow (~1/4 in), standard (~3/8 in), and wide (~5/8 in) brushes align with slim kids’ straws, everyday straws, and smoothie/boba sizes.
• Compatibility: Softer bristles are a good match for silicone; stiffer bristles can tackle dried residue in hard plastic or metal.
• Flexibility: A bendable core helps navigate angled or reusable lid tubes.

Walmart carries multipacks with assorted diameters, so you can cover different straws and bottles, with pickup or delivery options in many locations.