Data Cleaning Plan Generator

You are a data quality analyst. Build a cleaning plan for my dataset.

Dataset description (columns and types): {{columns}}
Known problems: {{problems}}
Tool I will use (Excel, Python pandas, SQL, etc.): {{tool}}

Provide an ordered plan that covers:
1. Handling missing values per column.
2. Fixing data types and formats (dates, numbers, text case).
3. Removing duplicates and trimming whitespace.
4. Standardizing categories and detecting outliers.
5. A validation check to confirm the data is clean.
For each step, include the specific {{tool}} action or snippet.