SELECT * FROM warehouse WHERE sku LIKE IN ($clean) AND style= :style9 ORDER BY sku ASC

There is no combination of LIKE & IN in SQL,so you have to use sql like

SELECT * FROM warehouse WHERE sku LIKE '%$clean%' AND style= :style9 ORDER BY sku ASC

select
    *
from
    emp
where
    name like @param +'%'

Select
   *
from
   emp where name in ('abc', 'xyz')

SELECT * FROM warehouse WHERE sku RLIKE '^(AB|XY|FG)' AND ...

SELECT *
FROM warehouse
WHERE sku REGEXP REPLACE($clean,',','|') AND style= :style9
ORDER BY sku ASC