For soldering recommendations for the EC6AW Series of DC DC converters from Cincon, you can refer to the below application note provided by manufacturer.
ISOLATED DC-DC Converter EC6AW SERIES APPLICATION NOTE
For the DIP Model, such as EC6AW-24S05, the manufacturer has provided manual soldering recommendations, as below.
And the cleaning condition of this series.
Applicable part numbers
EC6AW-48S12
EC6AW-24S33
EC6AW-24S12
EC6AW-48S05
EC6AW-24S05
EC6AW-48D12
EC6AW-48S33
EC6AW-24D05
EC6AW-48S15
EC6AW-24D15
EC6AW-24S15
EC6AW-24D12
EC6AW-48D05
EC6AW-48D15
2034-1946-ND
2034-1937-ND
2034-1939-ND
2034-1945-ND
2034-1938-ND
2034-1949-ND
2034-1944-ND
2034-1941-ND
2034-1947-ND
2034-1943-ND
2034-1940-ND
2034-1942-ND
2034-1948-ND
2034-1950-ND