How to Clean Oasis Kids Stainless Steel Tumbler

By Ello® | Water Bottles, Food Storage, Travel Mugs & More | Published: 2026-10-29

Category: Tips & Care

Keep your child's Ello Oasis tumbler spotless and leakproof with these simple cleaning steps. Learn dishwasher and hand-wash tips, plus how to remove stubborn stains.

Quick Answer

The Ello Oasis Kids Stainless Steel Tumbler is dishwasher safe, but for best results and to protect the Hide A Straw™ mechanism, hand washing with warm soapy water is recommended. Follow these steps to keep it clean and leakproof.

Why Proper Cleaning Matters for the Oasis Tumbler

The Oasis tumbler's 100% leakproof design relies on a retracting straw mechanism that can trap milk, juice, or smoothie residue if not cleaned regularly. Sticky buildup around the straw seal is the most common cause of leaks over time.

Stainless steel is naturally resistant to odors and stains, but it still needs routine care to stay hygienic for your child's daily use. A quick rinse after each use prevents residue from drying and becoming harder to remove.

Dishwasher vs. Hand Washing: What You Should Know

The Oasis tumbler is top-rack dishwasher safe, which is convenient for busy parents. However, high heat and harsh detergents can degrade the silicone straw seal faster than hand washing.

Hand washing gives you more control and extends the life of the leakproof mechanism. If you use the dishwasher, place the tumbler on the top rack away from the heating element and remove the straw lid for thorough cleaning.

How to Clean Your Oasis Kids Stainless Steel Tumbler

Step 1: Disassemble the Tumbler: Remove the lid and pull the straw up to its full extended position. Separate the silicone straw from the lid mechanism. Take off any rubber gaskets or seals if they are removable. Common mistake: washing the tumbler with the straw still retracted can leave residue trapped inside the lid cavity.
Step 2: Rinse Immediately After Use: Rinse all parts with warm water right after your child finishes drinking. This prevents milk, formula, or juice from drying and forming stubborn residue inside the straw and lid. Checkpoint: if you cannot rinse right away, fill the tumbler with warm water and let it soak until you can wash it properly.
Step 3: Hand Wash with Mild Soap: Use a soft sponge and mild dish soap to clean the stainless steel body, lid, straw, and all seals. Avoid abrasive scrubbers that can scratch the finish or damage the silicone parts. Common mistake: using bleach or harsh chemicals can corrode the stainless steel and degrade the leakproof seals.
Step 4: Clean the Straw and Lid Cavity Thoroughly: Use a small bottle brush or straw cleaner to scrub the inside of the silicone straw and the lid's straw channel. Pay special attention to the area where the straw retracts, as residue can hide there. Checkpoint: if the straw brush does not fit, soak the lid in warm soapy water for 10 minutes, then flush with clean water.
Step 5: Remove Stubborn Stains or Odors: For dried-on stains or lingering smells, fill the tumbler with a mixture of 2 tablespoons of baking soda and warm water. Let it soak for 15–20 minutes, then scrub gently with a soft sponge. Rinse thoroughly. Common mistake: using vinegar with baking soda inside a sealed tumbler can create pressure; always leave the lid off during soaking.
Step 6: Dry and Reassemble Completely: Air-dry all parts upside down on a drying rack. Make sure the straw, lid, and seals are completely dry before reassembling to prevent mold or mildew growth. Reattach the straw and lid only when everything is bone-dry. Checkpoint: store the tumbler with the lid off between uses to allow airflow and keep the interior fresh.

Product Spotlight

Oasis Kids Stainless Steel Tumbler: 100% leakproof with Hide A Straw™ technology – the straw retracts when not in use to keep the drinking surface clean. This means the straw mechanism needs regular cleaning to prevent clogs and maintain the leakproof seal, especially after drinks with pulp or protein.
Oasis Kids Stainless Steel Tumbler